Biology Keystone Homeostasis Review

Which statement best describes how channel and carrier proteins in the plasma membrane are similar?

• Both allow for the flow of molecules into and out of a cell.

• Both directly connect the membrane to the nucleus of a cell.

• Both use energy to continuously move water molecules out of a cell.

• Both cause the phospholipid bilayer to form a rigid membrane for a cell.

If ions against a concentration gradient to an area of higher concentration. Which molecule provides the energy needed for this movement to occur in a cell?

• ATP

• mRNA

• protein

• lipid

Which transport mechanisms require the formation of a vesicle to transport material into or out of a cell?

• diffusion and osmosis

• exocytosis and endocytosis

• exocytosis and calcium pumps

• diffusion and facilitated diffusion

Alveoli are microscopic air sacs in the lungs of mammals. Which statement best describes how the structure of the alveoli allows the lungs to function properly?

• They increase the amount of energy transferred from the lungs to the blood.

• They increase the flexibility of the lungs as they expand during inhalation.

• They increase the volume of the lungs, allowing more oxygen to be inhaled.

• They increase the surface area of the lungs, allowing efficient gas exchange.

Which example is an activity that a fish most likely uses to maintain homeostasis within its body?

• using camouflage to avoid predators

• feeding at night to regulate body temperature

• moving to deeper water to regulate metabolic wastes

• exchanging gases through its gills to regulate oxygen levels

Tags

NGSS.HS-LS1-3

A protein in a cell membrane changed its shape to move sodium and potassium ions against their concentration gradients. Which molecule was most likely used by the protein as an energy source?

• ATP

• ADP

• catalase

• amylase

The relative concentration of solute inside and outside a cell can cause water molecules to move across the membrane. Which phrase would be an alternate title to the diagram?

• Exocytosis in a Cell

• Active Transport in a Cell

• Osmosis Across a Membrane

• Facilitated Diffusion Across a Membrane

Carbon dioxide and oxygen are molecules that can move freely across a plasma membrane. What determines the direction that carbon dioxide and oxygen molecules move?

• orientation of cholesterol in the plasma membrane

• concentration gradient across the plasma membrane

• configuration of phospholipids in the plasma membrane

• location of receptors on the surface of the plasma membrane

Tags

NGSS.HS-LS2-5

Which cell process is best modeled by the diagram?

• osmosis

• exocytosis

• passive transport

• facilitated diffusion

A sodium-potassium pump within a cell membrane requires energy to move sodium and potassium ions into or out of a cell. The movement of glucose into or out of a cell does not require energy. Which statement best describes the movement of these materials across a cell membrane?

• Sodium and potassium ions move by active transport, and glucose moves by osmosis.

• Sodium and potassium ions move by active transport, and glucose moves by facilitated diffusion.

• Sodium and potassium ions move by facilitated diffusion, and glucose moves by osmosis.

• Sodium and potassium ions move by facilitated diffusion, and glucose moves by active transport.